Comparisons of Methods for Numerical Internal Wave Simulation in Long Range Acoustical Propagation
The only technique currently known for estimating all the statistical properties of an acoustical field propagating through a randomizing ocean is Monte Carlo simulation.The standard model in deep ocean propagation asserts that the randomization is due to sound speed perturbations caused by the vertical fluid displacements of random internal waves.The Henyey-Reynolds algorithm1 provides a computationally efficient method for generating these displacements for an ocean with range-independent stratification.This method, which is free from the Wentzel-Kramers-Brillouin approximation, uses vertical internal wave modes parameterized only by horizontal wavenumber magnitude, i.e., along only one dimension, as opposed to throughout the two dimensional horizontal wavenumber plane.Results are shown for the standard horizontallyisotropic Garrett-Munk spectral model, and compared to the Colosi-Brown algorithm2.Accurate models of the oceanographic mechanisms causing sound speed randomization will be needed in the estimation of the parameters of ocean mixing processes via inversion of acoustical fluctuation statistics.
Internal waves Simulation Long range acoustic propagation
Rex K.Andrew
Applied Physics Laboratory, University of Washington,Seattle, WA 98105, USA
国际会议
The 4th Pacific Rim Underwater Acoustics Conference (第四届环太平洋国际声学会议)
杭州
英文
23-30
2013-10-09（万方平台首次上网日期，不代表论文的发表时间）